In that case, Shelldra. Shelldra's impressive defensive spread (120/120/125) is imposing for a dragon type, though for a late game dragon, it is incredibly slow. Dragon/Rock with the inheritance of Shelgon's movepool and a few new toys isn't as strong as it seems. Yes its attack is high too, but it cant sweep unless you think 55 speed is good for dragon dancing. Its special attack is also a bit low at 85, meaning its only purpose is to fire blast dangerous steel types. That said, Dragon/Rock has a big steel problem either way, as it wants a nice full movepool of Earthquake, Stone Edge/Head Smash (depending if you went Solid Rock or Rock Head), Dragon STAB, Fire Blast and Slack Off. As a DDer, Tyranitar has higher speed, and Attack and Dark gets more SE hits.

That said, Shelldra could be a solid (heh) OU mon, but the real treat is the flavor: Shelldra is Shelgon to its most pertinent extreme, where the dream of flying fails to be realized, which is why it evolves with unhappiness. Stat tweaks could fix any dangerous attributes and perhaps Solid Rock and Slack Off are too much, but it can certainly rock the meta.

New Moves - Air Slash, Defog, Hurricane, Moonblast, MoonlightDesign - Looks like a unicornCompetitive - Rapidash can be a decent Raging Winds abuser having the choice of more power or more Speed, depending on the team's needs. Can also be a fast Special Attacker outside of Winds with a great ability on Magic Guard.

New Moves - Acrobactics, Air Cutter, Air Slash, Defog, Drill Peck, Fly, Gust, Hurricane, Peck, Roost, Sky Attack, Tailwind, Dazzling Gleam, Draining Kiss, Fairy Wind, Moonblast, Moonlight, Sweet Kiss, Psychic, Psyshock, Shadow BallDesign - Looks like a unicornCompetitive - Rapidash can be a decent Raging Winds abuser having the choice of more power or more Speed, depending on the team's needs. Can also be a fast Special Attacker outside of Winds with a great ability on Magic Guard.

New Moves - Acrobactics, Air Cutter, Air Slash, Defog, Drill Peck, Fly, Gust, Hurricane, Peck, Roost, Sky Attack, Tailwind, Dazzling Gleam, Draining Kiss, Fairy Wind, Moonblast, Moonlight, Sweet Kiss, Psychic, Psyshock, Shadow BallDesign - Looks like a unicornCompetitive - Rapidash can be a decent Raging Winds abuser having the choice of more power or more Speed, depending on the team's needs. Can also be a fast Special Attacker outside of Winds with a great ability on Magic Guard.

Prankster Toxic Spikes setter and burn spreader, or go with Eternal Suffering and deal some serious damage with burns. Bad Luck Bringer is an alright offensive ability, and combined with Fire Lash can really break through things.

New Moves - Dragon Pulse, Draco Meteor, Energy Ball, Mega Melt, Calm MindDesign - Looks more draconic, with blue "wings" sprouted from them, and their default expression seems angrier except for Magby. Magmortar becomes less "fat" and more nimble. All member of this Evolution line wears a red, draconic armor with blazing pattern.Competitive - Multiscales may seem random on a fire duck, but it comes from the armor itself, and it makes up for being frail (only on first hit at full HP though!), allowing to safely set up or to survive a powerful blow (but not too powerful)! I first opted for Nasty Plot, but looking at its Special Attack and Speed, maybe it would be too much, so I used Calm Mind instead. Energy Ball and Mega Melt are for coverage. Possibly the only non-Poison/Steel Dragon type capable to make Mimikyu bite the dust, too, thanks to neutrality to Fairy and Ghost, being faster, and Mold Breaker.

New Moves - Ice Hammer, Sword Dance, Ice Shard, Arctic Blade, ThunderbladeDesign - Their body had been covered in light blue fur (or an alternate of yellow and light blue in Electivire's case), and their antennas are encased in ice, and their arms are armed with icy blades. All members of this Evolution line wears a dark brown snow coat.Competitive - Electivire had gone through the most disappointing Electric-type Pokémon of Gen 4 to the powerful wallbreaker we wanted it to be. You can choose Thick Fat to neutralize your Fire weakness, Sheer Force to boost your Arctic Blade and Thunderblade, or Contrary to freely spam Ice Hammer and go faster and faster after each hit. While vulnerable to priority moves, anything that attempted to stall it without the use of Burn will be quickly smashed into pieces.

If anyone sees what's wrong, please warn me.

Edit Note 1: I changed Dragonoid Magmortar line's Storm Gales into Multiscale does to balance issues Raging Winds and I don't want to feel like a cheap cheaty punk for making Dragonoid Magmortar too broken.

New Moves - Sludge Bomb, Sludge Wave, Venoshock, Earth Power, Power GemDesign - Zebstika but with a green radioactive like glow.Competitive - A Toxic Terrain abuser, either by critting everything under the terrain with Merciless or by gaining Life Orb boost that can help against Pokémon immune to Poison. Sheer Force also allows it to act quite reliably outside of Toxic Terrain, and with great Speed and Special Attack stat, it can be quite a threat actually.

Doomdrake Helioptile
Item: Dragon Armor
Abilities: Bad Luck Bringer, Intimidate (HA: Anger Point)
Type: Dragon/Dark
Stats:
Hp: 44
Atk: 43 (+5)
Def: 33
Spa: 71 (+10)
Spd: 43
Spe: 75 (+5)
New Moves: Draco Meteor, Fire Blast, Nasty Plot, Roar, Taunt
All the yellow on Helioptile becomes a dark purple. It has a small club on the end of its tail, more hooked claws on its hands and feet and a much more angry look. It now holds its arms out more in front of it.

This thing is frail but has good speed and power for Little Cup as well as a good movepool. Can set up with Substitute and Nasty Plot.
Doomdrake Heliolisk
Item: Dragon Armor
Abilities: Bad Luck Bringer, Intimidate (HA: Berserk)
Type: Dragon/Dark
Stats:
Hp: 62
Atk: 60 (+5)
Def: 52
Spa: 124 (+15)
Spd: 89 (-5)
Spe: 114 (+5)
New Moves: Draco Meteor, Fire Blast, Nasty Plot, Noble Roar (Roar turns into this), Taunt
Doomdrake Heliolisk is taller than the normal Heliolisk and more leaned forward. It has small spikes running down its back, and a spiked club on the end of its tail. Its feet and hands have much sharper looking, more curved claws, It has a deep black, forked tongue, and the inside of its mouth is dark purple - it keeps its mouth open very slightly during battle, showing its small yet sharp black fangs. The black parts of its body remain black, while the yellow turns very dark blue.

It's a solid special attacker with the ability to set up with Substitute and Nasty Plot alongside potentially Berserk. However, it has no real way to break fairies. Looks fairly fun to use, in my opinion.

Doomdrake Helioptile
Item: Dragon Armor
Abilities: Bad Luck Bringer, Intimidate (HA: Anger Point)
Type: Dragon/Dark
Stats:
Hp: 44
Atk: 43 (+5)
Def: 33
Spa: 71 (+10)
Spd: 43
Spe: 75 (+5)
New Moves: Draco Meteor, Fire Blast, Nasty Plot, Roar, Taunt
All the yellow on Helioptile becomes a dark purple. It has a small club on the end of its tail, more hooked claws on its hands and feet and a much more angry look. It now holds its arms out more in front of it.

This thing is frail but has good speed and power for Little Cup as well as a good movepool. Can set up with Substitute and Nasty Plot.Doomdrake Heliolisk
Item: Dragon Armor
Abilities: Bad Luck Bringer, Intimidate (HA: Berserk)
Type: Dragon/Dark
Stats:
Hp: 62
Atk: 60 (+5)
Def: 52
Spa: 124 (+15)
Spd: 89 (-5)
Spe: 114 (+5)
New Moves: Draco Meteor, Fire Blast, Nasty Plot, Noble Roar (Roar turns into this), Taunt
Doomdrake Heliolisk is taller than the normal Heliolisk and more leaned forward. It has small spikes running down its back, and a spiked club on the end of its tail. Its feet and hands have much sharper looking, more curved claws, It has a deep black, forked tongue, and the inside of its mouth is dark purple - it keeps its mouth open very slightly during battle, showing its small yet sharp black fangs. The black parts of its body remain black, while the yellow turns very dark blue.

It's a solid special attacker with the ability to set up with Substitute and Nasty Plot alongside potentially Berserk. However, it has no real way to break fairies. Looks fairly fun to use, in my opinion.